Next generation wired/wireless network is being developed based on IP technology. In such IP based network, especially in a mobile environment, seamless mobility support is essential. However, existing Mobile IP, which is a typical mobility support protocol in an IP network, cannot satisfy all requirements for a future network. Especially the support for real-time service is critical issue in Mobile IP. In this paper, we have reviewed existing fast handover methods and proposed new handover scheme to enhance existing tunnel based handover method. Our proposed method has showed good performance for reducing traffic overhead in a backbone network. We think our proposed method will be useful in the IP based network in which there are a number of users using long real-time service, or the condition of traffic overhead is should be considered seriously in the network.